I did use scripts, however, I didn’t skip the vocab lessons, I just did them last (generally I did all of my level up reviews in 2 hours).
There is someone who did it in less than a year without an undo script, but AFAIK afterwords they had to reset to 47 and still have 1000s of reviews piled up.
Edit: Here it is, with 353 days: My Wanikani journey of 353 days, or what not to do
@ekuroe since you were curious too